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Triumph CC / CF specs: 152 ci 6-cylinder, 74.7 x 95 mm (2.9400 x 3.7400 in) bore and stroke. Rated 104 hp, 1969–1976. Used in the Triumph TR6.
The Triumph CC / CF is undersquare — the 3.74" stroke exceeds the 2.94" bore by 21.4% — a layout that trades peak RPM for leverage and torque low in the range. The 3.74" stroke puts mean piston speed at 4,000 ft/min around 6,400 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 25.3 ci (415 cc).
8 factory variants share these dimensions, rated at 104 hp across 1969–1976.
| Displacement | 152 ci |
|---|---|
| Bore | 2.94" |
| Stroke | 3.74" |
| Cylinders | 6 |
| Configuration | I6 |
| Bore/stroke ratio | 0.786 |
| Fuel type | gas |
|---|---|
| Advertised HP | 104 hp |
| Years | 1969–1976 |
| Bore/stroke character | 0.786 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,740 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 25.3 ci |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1969 | 104 hp | CC / CF |
| 1970 | 104 hp | CC / CF |
| 1971 | 104 hp | CC / CF |
| 1972 | 104 hp | CC / CF |
| 1973 | — | CC / CF |
| 1974 | — | CC / CF |
| 1975 | — | CC / CF |
| 1976 | — | CC / CF |
1 factory vehicle, 1969–1976. Each year opens that model's engine table.